API oil casing has a hollow section and most of them are used as a pipeline to transporting fluid. The main importing countries for API oil casing are UK, Saudi Arabia, Qatar, UAE, Kuwait, Oman, Germany, Japan, Italy, Britain, Austria, Switzerland, USSR (Russia),Venezuela and United States of America. There are three kinds of API specified length: namely R-1 is 4.88 ~ 7.62 m, R-2 is 7.62 ~ 10.36 m and R-3 are longer and its length can be up to over 10.36cm. API oil casing pipe is mainly used in oil and gas well drilling and oil and gas transmission. It includes petroleum drill pipe, oil casing, and tubing. The tube is widely applied to link the drill collar and drill bit and convey the oil drilling force. Your order, standard size or custom, can be entered, processed, and monitored in our excellent customer service until it is delivered to your facility in the time frame promised.